MersenneTwister.hh
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MersenneTwister.hh
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	#ifndef NPSTAT_MERSENNETWISTER_HH_
	#define NPSTAT_MERSENNETWISTER_HH_

	/*!
	// \file MersenneTwister.hh
	//
	// \brief A wrapper for the Mersenne Twister generator of pseudo-random numbers
	//
	// Author: I. Volobouev
	//
	// October 2010
	*/

	#include "npstat/rng/AbsRandomGenerator.hh"

	namespace npstat {
	namespace Private {
	class MTRand;
	}

	/**
	// Generator of pseudo-random numbers (with period 2^19937-1). Based on
	// the interface written by Richard J. Wagner to the original Mersenne
	// Twister.
	//
	// Reference:
	// M. Matsumoto and T. Nishimura, "Mersenne Twister: A 623-Dimensionally
	// Equidistributed Uniform Pseudo-Random Number Generator", ACM Transactions
	// on Modeling and Computer Simulation, Vol. 8, No. 1, January 1998, pp 3-30.
	*/
	class MersenneTwister : public AbsRandomGenerator
	{
	public:
	/** The default constructor will read /dev/urandom to get the seed */
	MersenneTwister();
	explicit MersenneTwister(unsigned long seed);
	MersenneTwister(const MersenneTwister&);
	virtual ~MersenneTwister();

	MersenneTwister& operator=(const MersenneTwister&);

	inline unsigned dim() const {return 1U;}
	double operator()();

	private:
	Private::MTRand* impl_;
	};
	}

	#endif // NPSTAT_MERSENNETWISTER_HH_